class Human:
    def __init__(self, name, age):
        self.name = name
        self.age = age

class Student(Human):
    grade = "Grade Unknown"

    def __init__(self, name, age, id, score):
        super().__init__(name, age)
        self.id = id
        self.score = score

        def print_info(self):
            print(
                f"Student ID: {self.id}, Name: {self.name}, Age: {self.age}, Score: {self.score}, Grade: {self.grade}")